Patent GB-709181-A (GB)
IPC: B41J11/54
Abstract: 709,181. Calcutating-apparatus. BURROUGHS CORPORATION. July 26, 1949, No. 19608/49. Class 106 (1). [Also in Groups XVI, XXIV and XXXVII] In an accounting machine having a travelling paper carriage, sets of control elements are mounted on a support movable in the carriage by a manipulative member to bring a particular set into an effective position to govern, during machine cycles with the carriage in its various columnar positions, mechanisms actuated by the machine driving means to control the operations of the machine. General.-The machine described, Fig. 1, is of the full keyboard, independently operated type. All entry and total-taking operations are performed in a single cycle of operation. The machine frame comprises side plates secured together by cross bars and is enclosed by casing panels carrying sound-deadening material. Specifications 709,185, 709,186, 709,187, 709,188, 709,189 and 709,190 are referred to. Main driving mechanism.-Depression of a main starting bar 291, Fig. 23, rocks a yoke 376 which rocks a lever 230 fast on a shaft 139. The lever 230 is rocked in a similar fashion by depression of any of the other starting bars or keys. A rearward arm of the lever 230 is thus moved from engagement against an arm of a yoke 217, carrying a rod 215 which is thus freed for a rearward movement under the action of a spring. Arms 234 on the shaft 139 are also moved from engagement against levers 225, 226 which carry a rod 223 also urged rearward by a spring. The rods 215, 223 are controlled by the keyboard as described below and are engaged by studs 214, 222 in a lever 213 freely pivoted on a stud 212 in the end of a starting arm 209 fast on a shaft 194. Normally the rods move rearwardly sufficiently to permit a spring 211, Fig. 21, to rock the arm 209 so that an arm 192 fast on the shaft 194 depresses an arm 150 of a yoke 146. The arm 150 rocks a yoke 154 to close a switch 159 in the motor circuit and a shoulder 144 of a downward arm of the yoke 146 frees an arm 142 of a clutch-control yoke 138. An arm 137 of this yoke thus frees the pawl of a one-revolution clutch, Fig. 18 (not shown), which is driven through a friction overload clutch by the motor and which drives the main shaft 126. A detent pawl on the onerevolution clutch prevents rebound of the main shaft after its cycle. The yoke 138 is restored by a stud 200 in an arm 197 on the main shaft. The motor circuit includes a centrifugal switch (see Group XXXVII), which is connected with a resistance in series with the motor so as to prevent excessive speed. In the middle of the cycle, cams on the main shaft restore the levers 225, 226 carrying the rod 223 slightly past its normal position to allow the levers to be re-engaged by the arms 234 if the shaft 139 is restored by its spring. Near the end of the cycle, a cam operates a link 246 which restores the yoke 217 by engaging a stud 250 therein. Keyboard. Starting arrangements.-The keyboard, Figs. 1, 21 and 24, comprises a pair of parallel frame plates which are secured in the main frame. The frame plates are inclined and the key-stems are slidably mounted between them so as to be inclined to the vertical, the arrangement providing for ease of operation and enabling depressed keys clearly to be seen. To the left of eleven denominational columns of amount keys 255 are three columns each of twelve keys 256 on which the date and a class symbol may be set. To the right of the amount keys are starting bars 291-4, a column of starting control keys 321-4 and 326 for a front totalizer and an error key 325 and a column of starting keys 315-8 and 320 for a rear totalizer and a repeat key 319. A spring 266 mounted longitudinally beneath each column of keys urges the keys upwardly. Each key stem has a series of slots to receive a fixed bar which limits vertical movement of the key, a longitudinally slidable detent bar 275 which is urged to the rear by a spring 279, and a corresponding hook of the detent bar. The rear nine of the right hand column of keys 256 are symbol keys and have a detent bar 288, Fig. 31, and the front three which correspond to different years have a separate detent bar 287. Similarly the rear nine of the centre column of keys 256 which are unit date keys and the front three tens date keys have separate detent bars. The detent bar for the front totalizer control keys has no notch to co-operate with the error key and the hook of the rear totalizer control keys detent bar which co-operates with the repeat key is shortened so as to be normally ineffective. The repeat key is normally latched down by rocking it laterally to engage a notch in its stem with the upper keyboard frame plate. An arm 344, pivoted on a stud 345, co-operates with reduced ends of the stems of the upper two of each column of control keys (the total and subtotal keys) so that depression of either key in one column prevents depression of both keys in the other column. Crowding lock slides co-operate with the key-stems of each column of control keys except the error and repeat keys. The main starting bar 291 is independent of all other bars and keys but the small motor bars 292-4 have a detent bar and crowding lock slides. The detent-bar hooks for the total, subtotal and subtract starting keys and the small starting bars are notched to retain a partially depressed key or bar in that position. Each of the detent bars 275 for the keys 255, 256 has a pair of lugs 283, 290 arranged in front of and behind the starting control rod 223. Similarly the control-key detent bars have lugs in front of and behind the rod 215 and the detent bar for the small starting bars has a lug behind the rod 215. Thus, if any key or bar (except the main bar 291) is only partially depressed, its detent bar holds the co-operating rod 223 or 215 from completing its rearward movement and the starting arm 209, Fig. 23, is unable to move sufficiently to initiate a machine operation. Moreover, if a total or subtotal control key is depressed, the corresponding detent bar is only permitted a small movement rearward, since the detent hooks for these keys are shorter than normal, and consequently the movement of the rod 215 is so limited that to cause the starting mechanism to operate, the rod 223 must be free to complete its rearward movement. Since such full movement is not permitted by the detent bar of a depressed amount key 255, the machine will not be started by depression of a total or subtotal key if an amount key is also depressed. During the first part of a machine cycle, the rods 223 and 215, in their rear positions, hold the detent bars to the rear and so lock all the keys and bars except the main starting bar. Depression of the error key 325 moves a notch in its stem from alignment with a projection 338 of a slide 339 so that a lever 341 pivoted thereto blocks rearward movement of the stud 212 in the starting arm to prevent a machine cycle. Normally, rearward movement of the stud 212 to initiate a cycle moves the slide 339 to prevent depression of the error key. Depression of the error key 325, Fig, 36, rocks a lever 425 and a pawl 428 thereon is urged forwardly to rock a lever 416 fast on a shaft 402, Fig. 25, carrying a radial plate 401. If the shaft 402 has been rocked clockwise the lever 425 rocks the lever 416 directly. Projections on slides 403, 407 carried by the plate 401 or the plate 401 itself then engage hooks 400 on the front ends of the detent bars for the keys 255, 256 to shift these bars and so release all depressed keys 255, 256. The lever 425 also operates a link 435 and a stud 438 therein rocks the bail 217 so that the rod 215 moves the detent bars for the control keys forwardly to release any depressed controls keys. A link 369, Fig. 23, connected to the rod 215 is normally coupled to a link 356 pivoted to a lever 355 and when the rod 215 is moved forwardly, a stud 354 in the lever 355 engages the lug of the detent bar for the small starting bars so as to release any one that had been depressed. The stud 438 in the link 435 also engages an arm 440 fast on the shaft 218 on which the levers 225, 226 are secured so as to restore the rod 223. The control keys and small starting bars are automatically released near the end of a cycle by the restoration of the rod 215 as described above. The shaft 402 is rocked to release depressed keys 255, 256 in the middle of cycle by a cam-controlled slide 444 having a hook 443 which engages a stud in the lever 416. The slide is at once restored sufficiently to allow a new amount to be set up prior to the end of the cycle. Depression of the repeat key 319 acts through a lever to move a slide 460 on a lever forwardly so that when the lever is cammed clockwise by operation of the slide 444, a lever 467, Fig. 25, mounted on a stud carried by, but perpendicular to, the shaft 402, is rocked to move the slide 403 so that the detent bars for the amount keys are not operated to release the keys when the shaft 402 is rocked. The plate 401 itself engages the detent bar for the nine symbol keys 256 and so these are always released during a cycle. The plate 401 is so notched and the projections of the slide 407 are such that when the slide is in a righthand position, no date keys 256 are automatically released in a cycle, and when the slide is in a centre position, the depressed keys of the centre column of keys 256 only are released. All of the date keys are released when the slide is in its lefthand position. A finger 478 of a slide 476 coupled to the slide 407 enables the latter to be manually adjusted and collars 479-481 on the shaft to which the slide 476 is secured cooperate with the detent bars for the keys 256 to prevent depression, or release by the error key, of a key 256 when and only when the slide 407 is positioned to prevent the release of all of the keys 256. Differential mechanism.-The stems of each denominational column of amount keys 255 cooperate with